chore(hetzner): bump hetznercloud/hcloud in /providers/hetzner

Bumps [hetznercloud/hcloud](https://github.com/hetznercloud/terraform-provider-hcloud) from 1.60.1 to 1.66.1.
- [Release notes](https://github.com/hetznercloud/terraform-provider-hcloud/releases)
- [Changelog](https://github.com/hetznercloud/terraform-provider-hcloud/blob/main/CHANGELOG.md)
- [Commits](hetznercloud/terraform-provider-hcloud@v1.60.1...v1.66.1)

---
updated-dependencies:
- dependency-name: hetznercloud/hcloud
  dependency-version: 1.66.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]